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Finding the Fourth Proportional to 745.02, 1,028.43 and 505.80

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Solution

The fourth proportional to 745.02, 1,028.43 and 505.80 is: 698.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    745.02 : 1,028.43 = 505.80 : x
  2. Step 2: Convert to fraction form
    745.02/1,028.43 = 505.80/x
  3. Step 3: Cross multiply
    745.02x = 1,028.43 × 505.80
  4. Step 4: Simplify right side
    745.02x = 520,179.89
  5. Step 5: Solve for x
    x = 520,179.89/745.02
  6. Step 6: Final answer
    x = 698.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.